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| Number | Title | Issue Date |
| 4839515 | Fiber optic transducer with fiber-to-fiber edge coupling A passive transducer apparatus and method of use for producing a useful output light signal in response to a sensed condition. The sensed condition varies the light emitted from a first fiber optic light conductor that is apparently captured or detected b... | 06/13/1989 |
| 4814600 | Electromagnetic radiation circuit element A touch-sensitive key particularly for use in a fibre-optic system has a radiation propagating unit (3) with a touching surface (5). Radiation input and output devices, such as optical fibres (1, 2), are arranged respectively to direct radiation at the to... | 03/21/1989 |
| 4652745 | Optical moisture sensor for a window or windshield A windshield moisture detector has two identical, symmetrically positioned prisms with an elongated body between an integral reflector and light transducer cavity. One light transducer cavity contains a light source and the other a light detector. The ref... | 03/24/1987 |
| 4647767 | Optical goniometer containing immiscible fluids having different refractive indices An optical encoding goniometer includes a rotatable chamber containing unequal volumes of two immiscible fluids having different indices of refraction and different densities. A plurality of optical fibers are bent to a critical radius and mounted in the ... | 03/03/1987 |
| 4641025 | System for determining the position of the boundary between substances having different refractive indices A device for determining the position of the boundary between first and second substances having different refractive indices that may be used to determine the level or volume of liquid in a container. The apparatus comprises a plurality of optical sensor... | 02/03/1987 |
| 4639594 | Fiberoptic probe and method of making and using A fiberoptic probe for in situ sensing of liquid level, concentration and/or phase change contains the optical and electrical components as well as a reference fluid so that the components are at the temperature of the fluid to be monitored. A reference f... | 01/27/1987 |
| 4637729 | Fiber optic moisture analysis probe Light in two different wavelengths, only one of which is attenuated by the presence of a substance to be tested for, is passed through a light path which includes a fluid path. The two wavelengths are equally attenuated by particulate contamination and al... | 01/20/1987 |
| 4634856 | Fiber optic moisture sensor with moisture-absorbing reflective target A method and apparatus for sensing moisture changes by utilizing optical fiber technology. One embodiment uses a reflective target at the end of an optical fiber. The reflectance of the target varies with its moisture content and can be detected by a remo... | 01/06/1987 |
| 4544840 | Fiber optic fluid impurity detector A generated signal is passed through an elongated signal conveying element positioned preferably perpendicular to the surface of a fluid the level of which is to be measured. The signal is directed from the signal conveying element to a detector element w... | 10/01/1985 |
| 4441817 | Electro-optical sensors with fiber optic bundles Method and apparatus for determining physical characteristics of an object, such as its location, utilizing a non-coherent fiber optic bundle. In one embodiment, a non-coherent fiber optic bundle containing up to 30% randomly non-aligned fibers is utilize... | 04/10/1984 |
| 4386269 | Method and device for detecting leaks from pipelines To detect leaks from pipelines carrying fluids, especially oil, light is transmitted through a fibre-optic held in proximity with the pipeline. The fibre-optic is surrounded by a medium of which the refractive index is altered by the influence of the leak... | 05/31/1983 |
| 4352983 | Method and apparatus for measuring concentration of suspended oils in water A method of quantitatively monitoring suspended oils in water combining the technologies of reversed-phase liquid chromatography and fiber optics is shown. A specially treated optical fiber collects and concentrates suspended oils on its surface so that o... | 10/05/1982 |
| 4270049 | Liquid leakage detection system Leakage of a liquid may be detected in terms of the drop in intensity of light rays traveling through a light guide core or optical fiber made of glass or synthetic resins due to the adhesion of the leaked liquid to the light guide.... | 05/26/1981 |
| 4240747 | Refractive-index responsive light-signal system A device for producing a light signal corresponding to the refractive index of a fluid medium comprises an elongated light-conducting body consisting of an input section and an output section connected to each other by an intermediate curved section adapt... | 12/23/1980 |
| 4221962 | Fiber-optic moisture sensor for composite structures A radiation carrier such as an optical glass fiber is embedded in a body of material such as a laminated composite panel with the free ends of the fiber extending to or beyond the edges of the structure so that radiation such as light can be directed thro... | 09/09/1980 |
| 4187025 | Device for producing a light signal corresponding to the refractive index of a fluid A device for producing a light signal corresponding to the refractive index of a fluid medium comprises an elongated light-conducting body consisting of an input section and an an output section connected to each other by an intermediate curved section ad... | 02/05/1980 |
| 4159420 | Apparatus for detecting oils and the like An improved apparatus suitable for detecting the outflow of a liquid such as petroleum or the like and petrochemical products from a storage tank or pipe line thereof is disclosed. The detecting apparatus comprises a detecting element including a light tr... | 06/26/1979 |
| 4045668 | Method and apparatus for immiscible liquids measurement A device for measuring the proportion of a first liquid in a lower refractive index second liquid with which the first liquid is immiscible, such as oil in water. An unclad optical fiber, having an index of refraction between those of the two liquids but ... | 08/30/1977 |
| 3947088 | Interface for light probe A viscous light transmissive fluid material, such as glycerine or the like, is applied to the solid end portion of a light conducting member of a light probe for optically coupling the latter with a sample having an irregular glossy surface. The fluid int... | 03/30/1976 |
